nfsd_server_flags="-h ipaddress" has no effect

Hi,

On relatively recent -current (main-n278917-233a26b5c5d7 amd64)
I was alarmed to find that on a dual-NIC host that if nfsd
is enabled with the -h flag set, the port appears open on all 
NICs and not just the internal facing one.

This behaviour is in contrast to rpcbind_flags="-h 192.168.1.100"
which when set means rpcbind cannot be seen on the external-facing
interface when tested.

Is this expected?

I would have expected port 2047 to be inaccessible from outside the 
network if nfsd is bound with -h to an internal-only interface/ip address
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