WP_Filesystem_SSH2::owner( string $file )

	public function owner($file) {
		$owneruid = @fileowner( $this->sftp_path( $file ) );
		if ( ! $owneruid )
			return false;
		if ( ! function_exists('posix_getpwuid') )
			return $owneruid;
		$ownerarray = posix_getpwuid( $owneruid );
		if ( ! $ownerarray ) {
			return false;
		}
		return $ownerarray['name'];
	}