littlebluebro

Ah sorry brain fart, yeah that command wouldn't be available on your server. You'd need to run it locally on the SMB mount and compare to the AFP. I'd try Squid's steps first though. I can play around with this when I get home and see if I can repro too

The .DS_Store files should be created on any type of volume or share (SMB or AFP, etc) so I don't think that's it. I wonder if it's getting some file system extended attribute added, though this should not change the actual hash of the file itself. Could you ssh in and inspect a bait file before mounting it on your Mac? Try running xattr /path/to/file and see what it returns and then run it again after mounting the share on your Mac.