code: function optionsOp(coll, opts, callback) {
    coll.s.db.listCollections({ name: coll.s.name }, opts).toArray((err, collections) => {
      if (err) return handleCallback(callback, err);
      if (collections.length === 0) {
        return handleCallback(
          callback,
          MongoError.create({ message: `collection ${coll.s.namespace} not found`, driver: true })
        );
      }
  
      handleCallback(callback, err, collections[0].options || null);
    });
  }
docs: Return the options of the collection.
  
  @method
  @param {Collection} a Collection instance.
  @param {Object} [options] Optional settings. See Collection.prototype.options for a list of options.
  @param {Collection~resultCallback} [callback] The results callback