** Description changed:

  On a Xenial installation after upgrading to the HWE 4.13.0-32-generic
  kernel it is not possible to use mount.cifs with -o vers=x.y different
  than 1.0.
  Steps to reproduce:
  1. Setup a local Samba share.
  2. Run:
- mount.cifs -o user=<myuser>,vers=2.0 //localhost/theshare/ /mnt/theshare
+ mount.cifs -o user=<myuser>,sec=ntlm //localhost/theshare/ /mnt/theshare
  (please note that not specifying the vers= option results in using protocol 
SMB2.1 which also results in the error).
  3. This may be repeated for the following versions: 2.0, 2.1, 3.0.
  Expected result:
  The share gets mounted at /mnt/theshare.
  Actual result:
  The share is not mounted, this gets printed in the console (and in dmesg):
  [  232.439162] CIFS VFS: ioctl error in smb2_get_dfs_refer rc=-2

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  mount.cifs stopped working with protocol version != 1.0

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