gistfile1.sh

# Do this before running vagrant up
vagrant plugin install vagrant-bindfs

Vagrantfile

Vagrant.configure("2") do |config|
  #...
  nfs_setting = RUBY_PLATFORM =~ /darwin/ || RUBY_PLATFORM =~ /linux/
  if nfs_setting
    config.bindfs.bind_folder '/vagrant', '/var/www/yourproject'
    config.vm.synced_folder "./", "/vagrant", id: "vagrant-root", :nfs => nfs_setting
  else
    config.vm.synced_folder "./", "/var/www/yourproject", id: "vagrant-root", :nfs => nfs_setting
  end
end