> I want to export /home/pcguest as read only and /home/<project> as
> read/write for some network.  /home resided on dedicated partition
[...]
> Question is: why i cannot export several directories from the same
> root directory with different access rights ?

Because the NetBSD implementation doesn't support it.  Access checking
is per-mountpoint on the server; you simply can't get different access
properties for different directory trees within the same server-side
mount point.

In principle this may be fixable, but it would be extremely difficult
(and probably computationally expensive) to get right - consider the
case where a directory is rename(2)ed from one sub-tree to another,
while a client has filehandles for objects under that directory.

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