_$memberof() {
    super._$memberof();

    let memberof;
    let parent = this._node.parent;
    while (parent) {
      if (parent.type === 'ClassDeclaration') {
        memberof = `${this._pathResolver.filePath}~${parent.id.name}`;
        this._value.memberof = memberof;
        return;
      }
      parent = parent.parent;
    }

    this._value.memberof = this._pathResolver.filePath;
  }
set memberof by using file path.