I\'m assuming that no phones with OS before marshmallow support the fingerprint API.
My questions are:
(a) Do all/any Samsung phones released with marshmallow
From my small investigation a had found the following. Pass API will help with Samsung devices, which had fingerprint api before android 6. It is devices of 2014 year with a fingerprint. The list of devices can be found here. https://en.wikipedia.org/wiki/Samsung_Galaxy The main devices:
They do not support the standard Google FingerPrint Api even after updating android to 6 version.