On his father's authority (this is AbulWalid's version): A man emancipated a share in a slave and the matter was mentioned to the Prophet ﷺ. He said: Allah has no partner. Ibn Kathir added in his version: The Prophet ﷺ allowed his emancipation.  

أَنَّ رَجُلاً أَعْتَقَ شِقْصًا لَهُ مِنْ غُلاَمٍ فَذَكَرَ ذَلِكَ لِلنَّبِيِّ ﷺ فَقَالَ لَيْسَ لِلَّهِ شَرِيكٌ زَادَ ابْنُ كَثِيرٍ فِي حَدِيثِهِ فَأَجَازَ النَّبِيُّ ﷺ عِتْقَهُ  

A man emancipated his share in a slave. The Prophet ﷺ allowed his (full) emancipation, and required him to pay the rest of his price.  

أَنَّ رَجُلاً أَعْتَقَ شِقْصًا لَهُ مِنْ غُلاَمٍ فَأَجَازَ النَّبِيُّ ﷺ عِتْقَهُ وَغَرَّمَهُ بَقِيَّةَ ثَمَنِهِ  

The Prophet ﷺ said: If a man emancipates a slave shared by him with another man, his emancipation rests with him (who emancipated his share). This is the version of Ibn Suwaid.  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ مَمْلُوكًا بَيْنَهُ وَبَيْنَ آخَرَ فَعَلَيْهِ خَلاَصُهُ وَهَذَا لَفْظُ ابْنِ سُوَيْدٍ  

If anyone emancipates his share in a slave, he emancipates him (completely) by his property if he has property. The narrator Ibn al-Muthanna did not mention al-Nadr b. Anas. This is the version of Ibn Suwaid.  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ أَعْتَقَ نَصِيبًا لَهُ فِي مَمْلُوكٍ عَتَقَ مِنْ مَالِهِ إِنْ كَانَ لَهُ مَالٌ وَلَمْ يَذْكُرِ ابْنُ الْمُثَنَّى النَّضْرَ بْنَ أَنَسٍ وَهَذَا لَفْظُ ابْنِ سُوَيْدٍ