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

*** 437,447 ****
  
          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)) {
                          /*
                           * special case for ".." and 'nohide'exported root
                           */
                          if (rfs_climb_crossmnt(&dvp, &exi, cr) != 0) {
                                  resp->status = NFS3ERR_ACCES;
--- 437,447 ----
  
          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) || VN_IS_CURZONEROOT(dvp))) {
                          /*
                           * special case for ".." and 'nohide'exported root
                           */
                          if (rfs_climb_crossmnt(&dvp, &exi, cr) != 0) {
                                  resp->status = NFS3ERR_ACCES;