I am specifying user and group in fstab, and everything mounted is owned by the user & group specified. But if I wanted another user to write to it, one that isn’t in the group, it doesn’t have access to write. The main issue is users in containers, as they can’t just be added to a group. Or rather, it would be unnecessary complicated to add them to a group.
I will take a look at NFS and see if that fits my needs.