Remove relationship from breadcrumb

[RenoLooijmans]

First of all - thanks for this great package!

Is it possible to somehow remove the relationship in the breadcrumb? I've tried it with modifying the config as well as addin the method parent returning null, but this does not seem to work as expected.

public function parent() {
     return null;
}

To clarify, I'd like to remove the belongsTo relationship in the breadcrumb:

Secondly, it seems that lenses are not supported?