Here's a pic of the father of a friend from work. He is enthusiastic about growing figs and elaborately protects them each winter. He brought this fig from Italy several decades ago (he came from there several decades before that).
Despite appearances, the fig isn't being grown in a container (at least with the roots in it). A few years ago, when the fig was smaller, he slipped the bucket (with the bottom cut off) on. Each winter, he fills the bottom with leaves. Then, he covers the top (sometimes pruning a bit for size) with 1-2 blankets, depending on their thickness. On top of the blankets goes a tarp, which is secured with bungee cord.
I don't think he has the barrel on all his figs, but he protects all of them with blankets and tarps each winter.