You can wrap the whole tree in parafilm or Buddytape except the area next to the soil. I would leave 1-2 inches away from the soil that is not covered because the skin/bark can wick moisture and you don’t want moisture getting under the film.
Also, before you wrap, make sure the scions/branches are dry. If you wrap moist branches, you can get mold unless you treated with a fungicide.
If you do wrap most of your tree, you have to keep an eye out for mold beneath the parafilm or Buddytape.
Simon