[vserver] assigning less than /64 to individual guests

I've been able to obtain only a native /56 from my hoster, so
I cannot allocate a /64 for each invidual guest.

Are there any reasons to not go with a /80 e.g. for invidual
vserver guests, as long as the /64 they're from is all on one
(V)LAN?

The basic functionality in psand.net kerners and util-vserver
is FYI there:

root@2:/# ping6 ipv6.google.com
PING ipv6.google.com(2a00:1450:8005::68) 56 data bytes
64 bytes from 2a00:1450:8005::68: icmp_seq=1 ttl=57 time=331 ms
64 bytes from 2a00:1450:8005::68: icmp_seq=2 ttl=57 time=14.8 ms
64 bytes from 2a00:1450:8005::68: icmp_seq=3 ttl=57 time=25.7 ms

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