code: def get_queries(self, project, expand=None, depth=None, include_deleted=None):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          query_parameters = {}
          if expand is not None:
              query_parameters['$expand'] = self._serialize.query('expand', expand, 'str')
          if depth is not None:
              query_parameters['$depth'] = self._serialize.query('depth', depth, 'int')
          if include_deleted is not None:
              query_parameters['$includeDeleted'] = self._serialize.query('include_deleted', include_deleted, 'bool')
          response = self._send(http_method='GET',
                                location_id='a67d190c-c41f-424b-814d-0e906f659301',
                                version='5.1-preview.2',
                                route_values=route_values,
                                query_parameters=query_parameters)
          return self._deserialize('[QueryHierarchyItem]', self._unwrap_collection(response))
docs: GetQueries.
          [Preview API] Gets the root queries and their children
          :param str project: Project ID or project name
          :param str expand: Include the query string (wiql), clauses, query result columns, and sort options in the results.
          :param int depth: In the folder of queries, return child queries and folders to this depth.
          :param bool include_deleted: Include deleted queries and folders
          :rtype: [QueryHierarchyItem]