code: public JimfsPath emptyPath() {
      JimfsPath result = emptyPath;
      if (result == null) {
        // use createPathInternal to avoid recursive call from createPath()
        result = createPathInternal(null, ImmutableList.of(Name.EMPTY));
        emptyPath = result;
        return result;
      }
      return result;
    }
docs: Returns an empty path which has a single name, the empty string.