Hide Attachment

functions.php

<?php
/*
 * Hide Media Images
 */
add_filter( 'posts_where', 'hide_attachments_wpquery_where' );
function hide_attachments_wpquery_where( $where ){
	global $current_user;
	if( !current_user_can( 'manage_options' ) ) {
		if( is_user_logged_in() ){
			if( isset( $_POST['action'] ) ){
				// library query
				if( $_POST['action'] == 'query-attachments' ){
					$where .= ' AND post_author='.$current_user->data->ID;
				}
			}
		}
	}

	return $where;
}
?>