# add
git subtree add --prefix lib/com.daplie.walnut ../../ns1.daplie.me/walnut.bak/packages/pages/com.daplie.walnut/ master --squash

# update
git subtree pull --prefix lib/com.daplie.walnut ../../ns1.daplie.me/walnut.bak/packages/pages/com.daplie.walnut/ master --squash