How to cross filter by owner with model form hierarchy in Django admin?

Question

Django

Created 2 models, one depends on the other, and the second one is a hierarchical directory, and the first is a list of owners of elements of a hierarchical directory.

class Constructor(models.Model): #  это наши владельцы
    title = models.CharField(max_length=120)
    def __unicode__(self):
            return self.title

class Section(MPTTModel): # а это наш иерархический справочник
    title = models.CharField(max_length=120)
    owner = models.ForeignKey(Constructor, parent_link=True) # связь с владельцем
    parent = TreeForeignKey('self', null=True, blank=True, related_name='children',
                                   db_index=True) # это поле от библиотеки django-mptt
    def __unicode__(self):
            return self.title

To display the tree, I use the github.com/django-mptt/django-mptt library , there is also a library for selecting values ​​in linked lists https://github.com/digi604/django-smart-selects , but my knowledge is clearly not yet enough to cross them. Already the second evening I fight. Because adding data to the database is already problematic. Please help if anyone knows how to do it. An example of tree output can be viewed here: practice.keyfire.ru/ideator/constructor/14 on the "Composition" tab. It is no longer possible to add new elements of this directory through the admin panel:

You need to make a selection by the owner, then you can continue.