public function createFtpDriver(array $config)
    {
        $ftpConfig = Arr::only($config, [
            'host', 'username', 'password', 'port', 'root', 'passive', 'ssl', 'timeout',
        ]);

        return $this->adapt($this->createFlysystem(
            new FtpAdapter($ftpConfig), $config
        ));
    }