如何限制Django admin中的非超级用户选择所有用户组/权限？

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import Group, Permission

from .models import CustomUser

class CustomUserAdmin(UserAdmin):
    def formfield_for_manytomany(self, db_field, request, **kwargs):
        if db_field.name == "groups" or db_field.name == "user_permissions":
            # 限制非超级用户只能选择自己所属的用户组和权限
            if not request.user.is_superuser:
                kwargs["queryset"] = db_field.related_model.objects.filter(
                    id__in=request.user.groups.values_list("id", flat=True)
                )
        return super().formfield_for_manytomany(db_field, request, **kwargs)

admin.site.unregister(Group)
admin.site.unregister(Permission)
admin.site.register(CustomUser, CustomUserAdmin)

from django.contrib import admin
from .models import CustomUser

admin.site.register(CustomUser, CustomUserAdmin)