Try to remove assumption that zone's root vnode is marked VROOT

@@ -437,11 +437,11 @@
 
         fhp = &args->what.dir;
         if (strcmp(args->what.name, "..") == 0 &&
             EQFID(&exi->exi_fid, FH3TOFIDP(fhp))) {
                 if ((exi->exi_export.ex_flags & EX_NOHIDE) &&
-                    (dvp->v_flag & VROOT)) {
+                    ((dvp->v_flag & VROOT) || VN_IS_CURZONEROOT(dvp))) {
                         /*
                          * special case for ".." and 'nohide'exported root
                          */
                         if (rfs_climb_crossmnt(&dvp, &exi, cr) != 0) {
                                 resp->status = NFS3ERR_ACCES;