New in version 2.3.
Get time signature marks attached to component:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> contexttools.TimeSignatureMark((2, 4))(staff)
TimeSignatureMark((2, 4))(Staff{4})
abjad> f(staff)
\new Staff {
\time 2/4
c'8
d'8
e'8
f'8
}
abjad> contexttools.get_time_signature_marks_attached_to_component(staff)
(TimeSignatureMark((2, 4))(Staff{4}),)
Return tuple of zero or more time_signature marks.