title: jsTree disable some of the checkboxes
body: <p>Using jsTree (3.1.0+) with checkbox plugin is it possible to allow not all checkboxes to check - disable some of them?</p>
  
  <p>I found solution for old versions of jsTree here <a href="https://stackoverflow.com/questions/8487305/jstree-disable-checkbox">jstree disable checkbox</a> but it didn't work on jsTree 3.1.0+ versions.</p>
  
  <p>Solution of hiding checkbox <a href="https://stackoverflow.com/questions/6112567/jstree-hide-checkbox">jsTree Hide Checkbox</a> is working, but if I click on the folder, hidden checkbox will be checked anyway.</p>
  
  <p>Thanks.</p>