docs: def stats(self):
          """
          Return storage statistics about the library
  
          Returns
          -------
          dictionary of storage stats
          """
  
          res = {}
          db = self._collection.database
          conn = db.connection
          res['sharding'] = {}
          try:
              sharding = conn.config.databases.find_one({'_id': db.name})
              if sharding:
                  res['sharding'].update(sharding)
              res['sharding']['collections'] = list(conn.config.collections.find({'_id': {'$regex': '^' + db.name + r"\..*"}}))
          except OperationFailure:
              # Access denied
              pass
          res['dbstats'] = db.command('dbstats')
          res['chunks'] = db.command('collstats', self._collection.name)
          res['versions'] = db.command('collstats', self._versions.name)
          res['snapshots'] = db.command('collstats', self._snapshots.name)
          res['totals'] = {'count': res['chunks']['count'],
                           'size': res['chunks']['size'] + res['versions']['size'] + res['snapshots']['size'],
                           }
          return res