title: MongoDB group-wise pagination
body: <p>Is there any query with pagination (skip, limit) where I can paginate based on a property or group. </p>
  
  <p><strong>e.g.</strong> If I have a Category and Product collections, where each product belongs to a category. Now I can easily query for products with pagination (skip, limit). </p>
  
  <p>Is there any way to query for products where I can use pagination (skip, limit) based on the Products category properties. 
  e.g. accessing 10 products (maybe limit of 10) for each category.</p>