Well not exactly the same as filtering on a two wheel machine, you cant filter past a car and curb.
Kerb.
It would have to be such a narrow gap in such an instance that you likely wouldn't consider it on a solo anyway.
Remember that the rest of the machine would have to clear the vehicle you're passing and many solos are just as wide...and if it was such a narrow gap you'd be more forcing your way through than filtering anyway.