You can switch between the space using different fingerprint or pattern which makes sure that nobody can notice even if you are using it before them. (techpp.com)
Moreover, the rear of the phone will feature different fingerprint scanner placement. (mobilesyrup.com)
You're also able to require simultaneous input from two different fingerprints for extra security, or for times when you might want to protect data shared by two people. (theverge.com)