Display Associated Top-Level Category Links on Sub-Level Categories

We’re trying to customize our categories so that when you view a sub-category, you’ll also see a list of top-level categories the sub-category belongs to.

The code we’re currently using is:

<br />
{foreach from=$categories item="category" name="categories"}<br />
   | <a href="{"categories.view?&category_id=`$category.category_id`"|fn_url}">{$category.category}</a><br />
  {/foreach}<br />

```<br />
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But 1) it doesn't seem to be showing these categories<br />
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and also 2) I thought of using Bread Crumbs, as that's essentially what we want (minus the 'Home' link at the top), but also including the other Top-Level categories.<br />
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Thirdly, 3) We're considering having these categories broken down by Feature, so other categories that contain product with a particular feature will be shown in this list.