Note that NFS doesn't support owner/group settings

lib/vagrant/config/vm.rb

@@ -46,7 +46,8 @@ module Vagrant
           :guestpath => guestpath,
           :hostpath => hostpath,
           :owner => nil,
-          :group => nil
+          :group => nil,
+          :nfs   => false
         }.merge(opts || {})
       end
 
@@ -117,6 +118,12 @@ module Vagrant
                        :name => name,
                        :path => options[:hostpath]))
           end
+
+          if options[:nfs] && (options[:owner] || options[:group])
+            # Owner/group don't work with NFS
+            errors.add(I18n.t("vagrant.config.vm.shared_folder_nfs_owner_group",
+                              :name => name))
+          end
         end
 
         # Each provisioner can validate itself

templates/locales/en.yml

@@ -173,6 +173,8 @@ en:
         box_missing: "A box must be specified."
         box_not_found: "The box '%{name}' could not be found."
         shared_folder_hostpath_missing: "Shared folder host path for '%{name}' doesn't exist: %{path}"
+        shared_folder_nfs_owner_group: |-
+          Shared folder '%{name}': NFS does not support the owner/group settings.
         provisioner_chef_server_changed: "The provisioner 'chef_server' is now 'chef_client'"
         provisioner_not_found: "The provisioner '%{shortcut}' doesn't exist."
         provisioner_invalid_class: "The provisioner '%{shortcut}' must inherit from `Vagrant::Provisioners::Base`."