Ideas for fetching shallow composition tree?

[KARR, DAVID (ATTCINW)]

Let's say that I have an entity called "Category" in a composition
relationship with itself.  The depth of these relationships won't be
very deep, perhaps 2-3 deep at the most.  I'm considering whether it's
possible to efficiently retrieve the entire composition tree with eager
fetches, even if these relationships are lazy by default.  I know I can
fetch one level at a time in an eager fashion, but is there any way to
have a single query assemble more than one level, or the entire
composition tree?