title: Django admin, filter objects for inline formset
body: <p>I've got an inline formset and I would like to exclude some model objects from being displayed in the formset. </p>
  
  <p>For eg. there is model B which has foreign key to model A, so it is a 1:n (A object has many B objects) relationship. Now on A admin edit page I've got inlines of B. I wonder if it is possible somehow to filter the list of B objects before the inline formset is rendered, so not all B objects related do A gets into the formset.</p>