Did you delete the default /ifs share?   If not, it exports everything to everybody and allows submounts.
Built out an nfs export, first without any ip's in the client box, and  everything worked fine. We then went and added four client to the client  box, yet still everyone was able to connect.  We then deleted the export,  recreated the export with ip's, and still, anyone could connect.   OneFS version is 6.5.5.4. thoughts??
NFS Export Issue