Ensuring data reaches disk

create("/tmp/whatever")
write("/tmp/whatever")
fsync("/tmp/whatever")
os.makedirs("a/b/c/d/e")
rename("/tmp/whatever", "a/b/c/d/e/obj.data")
fsync("a/b/c/d/e/")

Is it really required to fsync dirs all the way from e to a ? Fsync is totally not necessary for "a/b/c" as it already existed. But after doing a makedirs(), there's no way to know which subtree of "a/b/c/d/e" needs fsync().
Is it reasonable to fsync only the containing directory and expect the filesystem to take care of the rest (to make sure the entire tree makes it to disk) ?