Recently setting up a few Opensolaris NFS clients served from Linux exports, I encountered an error:

Jul 24 13:02:53 osolmobil.swatteksystems.com nfs: [ID 435675 kern.warning] 
WARNING: NFS server initial call to 192.168.0.64 failed: Not owner

To fix this, I added entries on the NFS clients like so within /etc/auto_master (unchanged) & /etc/auto_direct files:

/-  	/etc/auto_direct

/data		-onosuid,vers=3	192.168.0.64:/data