If you're talking about OpenZFS, that is a thin wrapper over knfsd/exports file. They don't actually ship an NFS daemon in the OpenZFS code.

ZFS is amazing, used it since around Solaris 10, and yes, loved it for it's NFS capability, had many terabytes at the time on it, back when a terabyte meant a rack of drives! Now those same systems host petabytes, all upgraded in place. Solaris was pretty amazing too.