title: How to get active class on parent route link when visiting any child route?
body: <p>Parent menu has links to routes A, B and C. Route B features a sub menu with links to child routes B1 and B2. When visiting B1 for instance, how to get <code>router-link-active</code> class not just on B1 link in sub menu, but also on parent menu B link?</p>
  
  <p>I found <a href="https://forum.vuejs.org/t/router-active-class-on-submenu-parent/7027" rel="noreferrer">this thread</a> from 2 years ago giving custom solution, is there anything simpler today or perhaps some native support to be enabled somehow?</p>