title: Defining what Sortable accepts?
body: <p>How can I define what items to accept in a sortable?</p>
  
  <p>Like, say I have the following pseudo markup:</p>
  
  <pre><code>&lt;ul id="draggable"&gt;
     &lt;li&gt;Item 1&lt;/li&gt;
     &lt;li&gt;Item 2&lt;/li&gt;
     &lt;li class="nodrag"&gt;Item 3&lt;/li&gt;
     &lt;li&gt;Item 4&lt;/li&gt;
  &lt;/ul&gt;
  
  &lt;ul id="sortable"&gt;
  
  &lt;/ul&gt;
  </code></pre>
  
  <p>I use the connectToSortable option in the Draggable to connect it to the sortable.</p>
  
  <p>Since I have sortables within sortables (INCEPTION!! ;) ) I want to be able to decide if a draggable is allowed to be dropped on a specific sortable.</p>
  
  <p>How can I do this? I currently use the sortable stop event for manipulating the dropped object - I tried removing the object if it contains the nodrag class, but the "snap" effect is still shown (the effect where the draggable slowly moves into place in the sortable)</p>
  
  <p>Is there any way I can do this?</p>