New in version 2.0.
Get first container in proper parentage of component:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> f(staff)
\new Staff {
c'8
d'8
e'8
f'8
}
abjad> containertools.get_first_container_in_proper_parentage_of_component(staff[1])
Staff{4}
Return container or none.