Shurafs in West Africa are a direct descendent of the Holy Prophet Mohammed (SAWS) through Imam Hassan (R.A) and his son Hasan Al Muthanna and his son Abdallah al Kamil (Wikipedia) and his son Idris I (Wikipedia) and his son Idris Al Akbar and his son. Overtime the family settled in Walata for many years and finally in Howdu (Mohamed Fadil Ould Mamina) for many years. From Howdu spread to West Africa. The Family today is identified as Alhulbait Rassoul, Hassanian, Idrissen, Fadilliyya.

“To proceed: O people, I am only human, and soon the messenger of my Lord will come to me and I will respond. I am leaving among you two weighty things, the first of which is the Book of Allah in which is guidance and light. Follow the Book of Allah and hold fast to it.” And he encouraged us to adhere to the Book of Allah, then he said: “And the people of my household, I remind you of Allah with regard to the people of my household, I remind you of Allah with regard to the people of my household, I remind you of Allah with regard to the people of my household.”. Narrated by Muslim in his Saheeh, no. 2408.

It was also narrated in other versions, such as that narrated by at-Tirmidhi: “I am leaving among you that which, if you hold fast to it, you will never go astray after I am gone, and one of the two is greater than the other: the Book of Allah, which is a rope extended from heaven to earth, and my family, the people of my household (ahl bayti). These two will never be separated until they come to me at the Cistern, so watch how you deal with them after I am gone.

Surah Ash – Shura, 42:23
ذَلِكَ الَّذِي يُبَشِّرُ اللَّهُ عِبَادَهُ الَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ قُل لَّا أَسْأَلُكُمْ عَلَيْهِ أَجْرًا إِلَّا الْمَوَدَّةَ فِي الْقُرْبَى وَمَن يَقْتَرِفْ حَسَنَةً نَّزِدْ لَهُ فِيهَا حُسْنًا إِنَّ اللَّهَ غَفُورٌ شَكُورٌ

23. that (bounty) whereof God gives the glad tiding to such of His servants as attain to faith and do righteous deeds. Say (O Prophet): “ No reward do I ask of you for this (message) other than (that you should) love my relatives.” For, if anyone gains (the merit of) a good deed, We shall grant him through it an increase of good: and, verily, God is much-forgiving, ever responsive to gratitude.

“Verily willeth Allah to keep away impurity from you O People of the House! and He purifieth you with the perfect purification,” (Surah al-Ahzaab, 33:33) the Holy Prophet (S) assembled his daughter Fatima (a), her two sons Hasan (a) and Hussein (a) and her husband, his cousin Ali (a) and covered the group including himself with his own mantle and addressing Allah said:
“O Allah! These constitute my progeny! Keep them away from every kind of impurity, purified with perfect purification.”