With all honor and respect to both Les Claypool and @kerushlow - careful that when you’re practicing your roll, you’re not barring.
Too Many Puppies is good for a barr(e?) - but Billy Jean is a better example of the finger roll.
The only reason I’m chiming in is because the tendency of folks to barre (trying to play the same fret on two (or more) adjacent strings with one finger) is counter productive to the finger roll. The finger roll keeps the fingers in position for fluid, articulate, independent movement. The barre sticks the hand to the bass, and limits movement.
They’re both absolutely useful, but please make sure that when you’re going for the roll, you’re working to stay loose and limber and flexible, and not allowing the fingers to barre.