Your filenames can't have colons in them? Sounds like a side-effect of keeping compatibility with 30 year-old Microsoft filesharing protocols. Samba is cool and

Your filenames can't have colons in them? Sounds like a side-effect of keeping compatibility with 30 year-old Microsoft filesharing protocols. Samba is cool and everything but SMB has no advantages over NFS, SSHFS, or even bind mounts on the same host.