return owner for files on windows

lib/train/extras/file_windows.rb

@@ -51,6 +51,26 @@ def mounted
       nil
     end
 
+    # PS C:\> Get-Acl .\test | select owner,group,audit | ConvertTo-Json
+    # {
+    #     "Owner":  "BUILTIN\\Administrators",
+    #     "Group":  "DEFAULT-CHEF-WI\\None",
+    # }
+    def owner
+      cmd = @backend.run_command(
+        "Get-Acl '#{@spath}' | select owner, group | ConvertTo-Json"
+      )
+      begin
+        owner = JSON.parse(cmd.stdout)
+      rescue JSON::ParserError => _e
+        return nil
+      end
+
+      # check that we got a response
+      return nil if owner.nil? || owner['Owner'].nil?
+      owner['Owner']
+    end
+
     def type
       if attributes.include?('Archive')
         return :file
@@ -61,7 +81,7 @@ def type
     end
 
     %w{
-      mode owner group uid gid mtime size selinux_label
+      mode group uid gid mtime size selinux_label
     }.each do |field|
       define_method field.to_sym do
         nil