Which country of nationality of a art director employed M0 's employee
SELECT DISTINCT ?x0 WHERE {
?x0 ^ns:people.person.nationality ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
?x1 a ns:film.film_art_director .
?x2 ns:people.person.employment_history/ns:business.employment_tenure.company M0
}