NFS root access. chown to unknown user

[tazinblack]

Hi everyone,

I have a freenas export mounted via NFS as User root on my machine.
If I want to chown some files to a user which is unknown by the freenas I get the error "opperation not allowed".
Is there a way to do some kind of root export as on other NFS servers, so the freenas does not check if the user for this id exists?

Or in other words, do I have to setup every user who wants to write files to the freenas on the freenas?

Freenas version is 8.3.1 release x64.


Thank you
taz