def get_filtered_root_folder(self):
        folder, filename = os.path.split(self.name)
        return os.path.join(folder, VERSATILEIMAGEFIELD_FILTERED_DIRNAME, '')
Returns the folder on `self.storage` where filtered images created
dataset/ETHPy150Open WGBH/django-versatileimagefield/versatileimagefield/mixins.py/VersatileImageMixIn.get_filtered_root_folder