why are you looking to limit root growth?

planting in containers is something we in colder zones do so that we can move the plants (inside). So you certainly can plant a fig in a container, but you will need to be mindful that doing so will mean a plant which is more carefree than many other fruiting plants will need more attention than it otherwise would.

Drainage will be more of a concern and so would watering (gets you coming and going as it were). Fruiting is not more likely given root constriction, as far as I'm aware. Also even water availability is necessary for fruit production (which is why we like to bury the bottom of our pots in northern climates).

~Chills