I don't grow fruit trees specifically, but I do have a few trees in containers, but they are treated the same. I personally do my root pruning a bit more methodically than just cutting the bottom inch off. Mind you, I use a gritty mix variant, so removal from the pot exposes the roots more readily. I like to bareroot the whole thing, and remove about 1/3 of the roots, focusing on the larger ones, as they don't provide much to the plant outside of anchoring, which isn't necessary in a pot. If kept up on, they aren't doing much in the way of transporting water and nutrients either. With the larger roots gone, the space can be filled with feeder roots.

This work should be done in late spring or early summer, when energy production is at its highest, to allow faster recovery. Right now is far from ideal, as the plants are using stored energy to get going, and aren't yet producing any energy to heal roots. With that said, after such work, keep them out of direct sun for a couple of weeks, but don't stash them in a garage. They need to produce energy, which requires light, but not direct sun which increases heat, leading to increased transpiration, which can overwhelm the root system. If you did this work last season, you may not need to do so this year. However, if you're using a peat moss based soil, you will need to do it ever year, which still isn't enough, to combat the effects of decomposition, which decreases soil drainage, leading to root rot problems.

Joe