Ok i know, there must be  a 100 apps that can handle files and fileservers but i have used this one for over a year and its great.

 

EZShare Pro

 

It allows you to connect to any fileserver i know about AND you can connect to/from your own computer to your IOS device.
(IOS device = Iphone or Ipad)
Its a little tricky to start with but after 10 minutes of fooling around you probably get the hang of it. You can get some info from the manufactures web.

Examplelink