hammer2_chain_getparent
hammer2_chain_t *hammer2_chain_getparent(hammer2_chain_t *chain, int flags);
parent = hammer2_chain_getparent(chain, HAMMER2_RESOLVE_ALWAYS);
parent = hammer2_chain_getparent(chain,
hammer2_chain_t *hammer2_chain_getparent(hammer2_chain_t *chain, int flags);
parent = hammer2_chain_getparent(chain, HAMMER2_RESOLVE_ALWAYS);
parent = hammer2_chain_getparent(chain,