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

@@ -409,11 +409,11 @@
 rfs_climb_crossmnt(vnode_t **dvpp, struct exportinfo **exip, cred_t *cr)
 {
         struct exportinfo *exi;
         vnode_t *dvp = *dvpp;
 
-        ASSERT(dvp->v_flag & VROOT);
+        ASSERT((dvp->v_flag & VROOT) || VN_IS_CURZONEROOT(dvp));
 
         VN_HOLD(dvp);
         dvp = untraverse(dvp);
         exi = nfs_vptoexi(NULL, dvp, cr, NULL, NULL, FALSE);
         if (exi == NULL) {

@@ -488,11 +488,11 @@
          * then the ".." refers beyond the root of an exported filesystem.
          */
         if (strcmp(da->da_name, "..") == 0 &&
             EQFID(&exi->exi_fid, (fid_t *)&fhp->fh_len)) {
                 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) {
                                 error = NFSERR_ACCES;