GID
if (oldGroup->GID() != group->GID()
fGroupsByID[group->GID()] = group;
fGroupsByID.erase(fGroupsByID.find(group->GID()));
fGroupsByID.erase(fGroupsByID.find(group->GID()));
groups[count] = group->GID();
inline uint32 GID() const { return fNode.gid; }
st->st_gid = node->GID();
if ((statMask & B_STAT_GID) != 0 && st->st_gid != node->GID()) {
} else if (is_user_in_group(node->GID())) {