samba: Local devices using IPv6 are blocked

Original post on forum: https://discuss.freedombox.org/t/samba-share-not-accessible/2554/4

We only allow addresses in local IPv6 ranges to connect: [::1] [fc00::]/7 [fe80::]

However since NAT is not generally used with IPv6, it's most likely that even local devices will have addresses outside of this range.