Can't see the NFS shared directory in Vagrant - ruby

Question

I try to create an NFS share directory in the vagrant box, but for some reasons I can not see the shared directory when I login to the box via ssh.
This is my Vagrantfile:
# -*- mode: ruby -*-
# vi: set ft=ruby :
Vagrant.configure(2) do |config|
config.vm.box = "hashicorp/precise32"
config.vm.synced_folder "./shared", "/st/data", :nfs => true
config.vm.network "private_network", ip: "192.168.33.10"
end
Vagrant reload output:
vagrant reload
==> default: Attempting graceful shutdown of VM...
==> default: Checking if box 'hashicorp/precise32' is up to date...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
default: Adapter 1: nat
default: Adapter 2: hostonly
==> default: Forwarding ports...
default: 22 => 2222 (adapter 1)
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
default: SSH address: 127.0.0.1:2222
default: SSH username: vagrant
default: SSH auth method: private key
default: Warning: Connection timeout. Retrying...
==> default: Machine booted and ready!
GuestAdditions 5.0.6 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Configuring and enabling network interfaces...
==> default: Exporting NFS shared folders...
==> default: Preparing to edit /etc/exports. Administrator privileges will be required...
==> default: Mounting NFS shared folders...
==> default: Mounting shared folders...
default: /vagrant => /Users/stk/Documents/vagrant
==> default: Check for insecure vagrant key: OK (not present)
==> default: Machine already provisioned. Run `vagrant provision` or use the `--provision`
==> default: flag to force provisioning. Provisioners marked to run always will still run.
After vagrant ssh I can't see any nfs directory.
vagrant -v
Vagrant 1.7.4
OSX:
10.10.3
I tried most of the solutions mentioned here, but still no luck.