The boots I have, have 12% movement speed on base, and 20 as unique affix.
So they should give me 32% increased movement speed.
I have been testing them (both running around and looking at character sheet), along with blue/yellow boots that have different movement speed bonuses, and it seems that Eterra’s Path only gives its base bonus.
Don’t know if it still gives bonus to minions, it’s harder to notice.