What are the technical and security features of the iPhone 7 fingerprint reader? I'm looking for technical material that describes the quality of the iPhone 7 fingerprint reader, and ideally previous models as well.

My hope, is that the specification is more in alignment with NIST/FBI requirements.
these links may help. The first link is apple's Touch ID privacy info, and the second is about federal government forcing people to unlock their phones using Touch ID. 

https://support.apple.com/en-us/HT204587

https://9to5mac.com/2016/05/02/federal-court-touch-id-fingerprint/