Disable WordPress Media Attachment Comments

gistfile1.php

<?php 
/*
 * http://www.wpbeginner.com/wp-tutorials/how-to-disable-comments-on-wordpress-media-attachments/
 */
function filter_media_comment_status( $open, $post_id ) {
    $post = get_post( $post_id );
    if( $post->post_type == 'attachment' ) {
        return false;
    }
    return $open;
}
add_filter( 'comments_open', 'filter_media_comment_status', 10 , 2 );