mount: 192.168.1.164:/home/piyo/project/hoge/ failed, reason given by server: Permission denied
exportsにはちゃんと書いたつもりなので調べる。
http://www.linux.or.jp/JF/JFdocs/NFS-HOWTO/troubleshooting.html
# exportfs -ra exportfs: /etc/exports [3]: No 'sync' or 'async' option specified for export "192.168.1.0/255.255.255.0:/home/piyo".
syncをつけて万事解決