Exactly. There is research and general qualitative data that shows the impact of more experienced teachers coaching and mentoring new educators. In this unbundling context mentorship also applies to higher ed/academia, where more experience professors coach/support PhD students and new instructors.
Edtech Handbook 
By mentorship, do you mean the more experienced teachers mentoring their younger colleagues?
Exactly. There is research and general qualitative data that shows the impact of more experienced teachers coaching and mentoring new educators. In this unbundling context mentorship also applies to higher ed/academia, where more experience professors coach/support PhD students and new instructors.