code: function (path) {
      return this._getParentId(path).then((parentId) => {
        return this._request('POST', BASE_URL + '/drive/v2/files', {
          body: JSON.stringify({
            title: metaTitleFromFileName(baseName(path)),
            mimeType: GD_DIR_MIME_TYPE,
            parents: [{
              id: parentId
            }]
          }),
          headers: {
            'Content-Type': 'application/json; charset=UTF-8'
          }
        }).then((response) => {
          const meta = JSON.parse(response.responseText);
          return Promise.resolve(meta.id);
        });
      });
    }
docs: Create a directory.
  
  Creates all parent directories as well if any of them didn't exist yet.
  
  @param {string} path - Directory path
  @returns {Promise} Resolves with the ID of the new directory
  
  @private