title: Get a list of collections for all products in current Shopify collection
body: <p>We have a primary collection of t-shirts for the product type of clothing (product type is just in case, so, nobody would bring it up).
  And all of them are also in a few other collections like "linen t-shirts", "silk t-shirts" etc.
  Let's say i'm on the page of t-shirts collections, and I need to display a list of all the secondary collections like linen, silk and so on. How do I do that?
  What I've got so far, is I can get a list of collections for each individual product with following code. Further, I'd pull them and sort with js. But I was really hoping for an easier way to get the list.</p>
  
  <p>Here's the liquid code I'm using for each product's collection list:</p>
  
  <pre><code>{% for product in collection.products %}
     {% for collection in product.collections %}
        &lt;div&gt;{{collection.title}}&lt;/div&gt;
     {% endfor %}
  {% endfor %}
  </code></pre>
  
  <p>p.s.
  variants are not an option neither</p>