If I have a typical entry in my routes file for importing routes from a module

```
*       /admin                  module:crud

```

is there a way for me to determine that the base path for the `crud` module is `/admin`, other than just parsing the main routes file myself? It doesn't appear that the `Router` class keeps this information.

The ultimate goal is to create a menu for each module. If I have a user management module imported at `/useradmin`, I want to generate a menu containing `/useradmin/users` and `/useradmin/groups` but not deeper descendants such as `/useradmin/users/new`. If `/useradmin` is routed to something, I'll use that as the link for the menu's label, otherwise I'll just show a plain text label.

While I might be able to fake it without knowing, it seems like knowing the actual base url for the module would be the best way to ensure I can handle various special cases such as modules imported at `/modules/useradmin` or modules that grandchild paths but no child paths (`/useradmin/users/new` but no `/useradmin/users`).