tail: unrecognised file system type 0x53464846 for ‘ls.txt’. please report this to bug-coreutils@gnu.org. reverting to polling

The file still updated as it was written to, and didn't crash or anything, but I thought I'd do my duty and report this. I'm sure this is a very niche use case. I'm using Windows 10 Version 1607, build 14393.576