How To Add Filter On Specified HTTP Method and Controller in Routes.php?

What I've tried to achieve is add filter on specified http method and controller. Like:

PHP Code:

$rotues->get('/', 'Home::index', ['filter' => 'user']);
$rotues->post('/', 'Home::new', ['filter' => 'admin']); 


But when I call the HTTP GET method, the filter is always use admin while I specified that to use user. How could I achieve this? Thanks.