Filter the title for WP Nested Pages

gistfile1.txt

add_filter('the_title', 'edit_np_title', 10, 3);

function edit_np_title($title, $id, $view = 'nestedpages_title'){
    if(is_admin() && isset($_GET['page']) && $_GET['page'] == 'nestedpages-posttype'){
        $prefix = 'prefix';

        if($prefix){
            $title = '[' . $prefix . '] ' . $title;
        }
    }
    return $title;
}