redirect image attachment pages in wordpress

1function myprefix_redirect_attachment_page() {
2	if ( is_attachment() ) {
3		global $post;
4		if ( $post && $post->post_parent ) {
5			wp_redirect( esc_url( get_permalink( $post->post_parent ) ), 301 );
6			exit;
7		} else {
8			wp_redirect( esc_url( home_url( '/' ) ), 301 );
9			exit;
10		}
11	}
12}
13add_action( 'template_redirect', 'myprefix_redirect_attachment_page' );