Possible to achieve with shaders?

Pardon my ignorance, I am new to this world.

I would like to make a shader that would render an object transparently, however, the object will not render overlap with itself. Take, for example, an object such as a donut. When viewing it from the side where you cannot see it's hole, if it is transparent, you would normally see 4 layers of transparency (frontmost layer, layer for the hole, another layer for the hole, then the outermost layer). I wish to have a shader that, in that case, only renders the front most layer (1). Is this possible? if so, are there any well documented techniques to achieve this?

 

Also docs indicate how also: http://docs.unity3d.com/Manual/SL-CullAndDepth.html