Stop drop if item belongs to another dynamically created dropzone of same type?

[dssagar93]

So I have 2 lists and each one of them have their own sublists. I have 2 Dropzone, nested, one inside another. Now, the problem here is that if the user moves an item from sublist of A to sublist of B, it's allowing it. Can I somehow stop it? The drag should be inside its own dropzone.