  The disintegration of solar filaments via mass drainage is a frequently
observed phenomenon during a variety of filament activities. It is generally
considered that the draining of dense filament material is directed by both
gravity and magnetic field, yet the detailed process remains elusive. Here we
report on a partial filament eruption during which filament material drains
downward to the surface not only along the filament's legs, but to a remote
flare ribbon through a fan-out curtain-like structure. It is found that the
magnetic configuration is characterized by two conjoining dome-like
quasi-sepratrix layers (QSLs). The filament is located underneath one QSL dome,
whose footprint apparently bounds the major flare ribbons resulting from the
filament eruption, whereas the remote flare ribbon matches well with the other
QSL dome's far-side footprint. We suggest that the interaction of the filament
with the overlying QSLs results in the splitting and disintegration of the
filament.
