hfslib_find_parent_thread
parent_cnid = hfslib_find_parent_thread(in_vol, child_cnid,
hfslib_find_parent_thread(in_vol, in_cnid, &parentthread, cbargs);
if (hfslib_find_parent_thread(in_vol, in_cnid, &fileparent,
hfs_cnid_t hfslib_find_parent_thread(hfs_volume*, hfs_cnid_t,