Hilight hightest menu level

Hi,

I higlight the active page in the menu.

For example:
(1 level) https://v2.justillon.de/ highlights -> “Startseite”
(2 levels) https://v2.justillon.de/category/recht-kurios/ highlights -> “Kategorien” and “Kurioses”.

Now I want 3 levels. Meaning that if I open an article which is in the category “Kurioses” it should Highlight “Kategorien” and “Kurioses” as well.

However I just get a highlight at “Kurioses” working but not on the top level. https://v2.justillon.de/2016/01/mit-mehr-als-70-kmh-gegen-einen-baum-zu-fahren-verboten/

I already use
.mh-main-nav .current-menu-parent,
.mh-main-nav .current-menu-item,
.mh-main-nav .current-menu-ancestor,

But the top level of the article just gets not higlighted.

Can you help me?

Thx!