synchronized (mutex) {
        return map(delegate().row(rowKey), mutex);
      }
    }

    @Override
    public Map<R, V> column(@ParametricNullness C columnKey) {
      synchronized (mutex) {
        return map(delegate().column(columnKey), mutex);
      }
    }

    @Override
    public Set<Cell<R, C, V>> cellSet() {
      synchronized (mutex) {

    }


    /**
     * If the path of this <code>SmbFile</code> falls within a DFS volume,
     * this method will return the referral path to which it maps. Otherwise
     * <code>null</code> is returned.
     * 
     * @return URL to the DFS volume
     * @throws SmbException
     */
    public String getDfsPath () throws SmbException {
        try {