When exporting a LUFS mount (usually a sshfs or ftpfs) through samba,
creating a new folder also creates a hidden file starting with .nfs
The hidden file cannot be removed until the samba share is disconnected
and the LUFS mount remounted.
The problem does not arise when sharing ordinary folders or files, or when
manually creating folders from the console (or shell)
the kerbel is creating this file, not samba. Not our bug.