dmu_objset_clone
error = dmu_objset_clone(clone1name, snap1name);
error = dmu_objset_clone(clone2name, snap3name);
error = dmu_objset_clone(clonename, fullname);
int dmu_objset_clone(const char *name, const char *origin);
error = dmu_objset_clone(fsname, origin_name);