From the Prophet ﷺ with the same meaning. Nafi would sometimes say, "Then whatever portion of him was freed has been freed," and at other times he would not say it.
حدثنا مؤمل حدثنا إسمعيل عن أيوب عن نافع
عن النبي ﷺ بمعناه قال وكان نافع ربما قال فقد عتق منه ما عتق وربما لم يقله
Abd, no: 49/1501 onward. Reference: Reported by Muslim, Oaths, chapter on one who frees his share in a slave, no: 1667, from the hadith of Ismail bin Ulaya, through this same chain.