I'm using a Samsung Galaxy S8 running Android 7.0, last update August 2017. I am not using smartlock.
When I lock the phone, the initial screen shows a button labeled "Press to unlock." If I hit the Back button on the lower right corner I either get right to my primary screen or to a second login page. The difference seems to be related to the amount of time the phone has been inactive.
From the second login page I have to enter my passcode. Prior to installing the app, I did not have a path from the login screen directly to my applications screen without entering the passcode.
I like the app. I wished it didn't appear to allow skipping the authentication.