*tl;dr* stat returns 64-bit value fffffffffe534d42 for filesystem type of smb2, expected fe534d42.
This README <https://github.com/coreutils/coreutils/blob/master/README> instructs sending bug reports to this email address (can I create a github Issue instead?) The following prints an unexpected result $ stat --file-system --printf='(%i) filesytem ID in hex\n(%t) filesytem type in hex\n(%T) filesystem type in hrf' /mnt/cifspath/monitor1 (1a) filesytem ID in hex (fffffffffe534d42) filesytem type in hex (smb2) filesystem type in hrf Using Raspbian 9.8 stretch on Raspberry Pi B $ uname -a Linux host 4.14.98+ #1200 Tue Feb 12 20:11:02 GMT 2019 armv6l GNU/Linux $ lsb_release -a Description: Raspbian GNU/Linux 9.8 (stretch) Release: 9.8 Codename: stretch cpuinfo $ cat /proc/cpuinfo processor : 0 model name : ARMv6-compatible processor rev 7 (v6l) BogoMIPS : 897.37 Features : half thumb fastmult vfp edsp java tls CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xb76 CPU revision : 7 Hardware : BCM2835 Revision : 000d This was noticed while diagnosing bug qbittorrent/qBittorrent/issues/10367#issuecomment-471415003 <https://github.com/qbittorrent/qBittorrent/issues/10367#issuecomment-471415003> . Thanks. James Thomas Moon https://github.com/jtmoon79