Based on I'm suspecting that it's this commit from upstream stable:

db9f727 fs/cifs: make share unaccessible at root level mountable

I'll make a test kernel with that reverted for testing.

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https://bugs.launchpad.net/bugs/1626112

Title:
  Permission denied in CIFS with kernel 4.4.038

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,

  I'm experiencing problem accessing a remote CIFS mounted with kernel
  4.4.0.38.

  The mount succeed but I can't list the content.

  ll /home/nico/mnt/carpetes
  ls: cannot open directory '/home/nico/mnt/carpetes': Permission denied

  
  The mount command is:
  sudo mount -t cifs //windowsdomain.ad/carpetes/documents 
/home/nico/mnt/carpetes -o 
user=nico,password=mypassword,domain=windowsdomain.ad,sec=ntlm,file_mode=0777,dir_mode=0777

  I can change directory to the mounted CIFS but can't list the content.
  Even with root user the error message is:

  ll /home/nico/mnt/carpetes
  ls: reading directory '/home/nico/mnt/carpetes': Object is remote
  total 0

  Thank you very much for helping.

  Best regards,
  Nico
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nico       2741 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux 18
  HibernationDevice: RESUME=UUID=62f559ea-4eb1-4b4f-be21-d6a8ae558fe0
  InstallationDate: Installed on 2016-09-13 (8 days ago)
  InstallationMedia: Linux Mint 18 "Sarah" - Release amd64 20160628
  IwConfig:
   enp0s3    no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  ProcFB: 0 vboxdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-38-generic 
root=UUID=d2e01c93-3645-4d39-8d01-617b7416b761 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-38.57+lp1612135v201609211623-generic 4.4.19
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-38-generic N/A
   linux-backports-modules-4.4.0-38-generic  N/A
   linux-firmware                            1.157.3
  RfKill:
   
  Tags:  sarah
  Uname: Linux 4.4.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxsf
  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nico       2748 F.... pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux 18
  HibernationDevice: RESUME=UUID=62f559ea-4eb1-4b4f-be21-d6a8ae558fe0
  InstallationDate: Installed on 2016-09-13 (9 days ago)
  InstallationMedia: Linux Mint 18 "Sarah" - Release amd64 20160628
  IwConfig:
   enp0s3    no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  Package: linux (not installed)
  ProcFB: 0 vboxdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic 
root=UUID=d2e01c93-3645-4d39-8d01-617b7416b761 ro quiet splash
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157.3
  RfKill:
   
  Tags:  sarah
  Uname: Linux 4.4.0-21-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxsf
  _MarkForUpload: True
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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