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
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);
      });
    });
  }