Hide parents in sidebar menu

Hi support,
After trying many CSS combinations I finally found a way to have it work :)
It’s probably not very “clean”, but it works.
Thanks,
Antoine

ul.children li:before {
display:none !important;
}

.nested_nav .page_item_has_children > a {
    display: none !important;
}

ul.nested_nav > li {
    display: none;
}

ul.nested_nav li.current_page_ancestor {
    display: block;
}