I\'ve written a small FUSE-based filesystem and now the only part\'s missing is that I want to register it with fstab(5) to auto-mount it on system startup and/or manually mount
You could just use fuse filesystem type. The following works on my system:
smbnetfs /media/netbios fuse defaults,allow_other 0 0
Another example:
sshfs#user@example.com:/ /mnt fuse user,noauto 0 0