Thanks to all,
I’ve been using this for ages but recently it stopped working. It may have been when Samba on my file server updated to 4.7.1 or it may have been an OSMC update. To cut a long story short I was seeing a load of:
Dec 26 08:56:57 osmc kernel: Status code returned 0xc0000017 NT_STATUS_NO_MEMORY
Dec 26 08:56:57 osmc kernel: CIFS VFS: Send error in SessSetup = -121
Dec 26 08:56:57 osmc kernel: CIFS VFS: cifs_mount failed w/return code = -121
in the journal. The solution was to add “domain={my_domain_or_workgroup}” to the options. In my case is is “domain=home” as I’ve set my workgroup to “home” on my Samba server.
HTH