OSMC NFS mount
It looks like you need some systemd "magic" to successfully mount an NFS share on OSMC. Adding "x-systemd.automount,noauto" to the mount options in /etc/fstab did the trick for me.
root@osmc:~# connmanctlThis enables IPv6 with autoconfiguration, turns on Privacy Extensions and prefers these ephemeral addresses over the autoconfigured ones.
connmanctl> services
*AO Wired ethernet_b827ebaabbcc_cable
connmanctl> config ethernet_b827ebaabbcc_cable --ipv6 auto preferred
connmanctl> quit
root@osmc:~#