Why .dup not work with multidimensional arrays?

[Dennis Ritchie via Digitalmars-d-learn]

On Friday, 8 May 2015 at 02:23:23 UTC, E.S. Quinn wrote:
> It's because arrays are references types, and .dup is a strictly
> shallow copy, so you're getting two outer arrays that reference
> the same set of inner arrays. You'll have to duplicated each of
> the inner arrays yourself if you need to make a deep copy.

Thank you. It really works :)

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import std.stdio;

void main() {

	auto c = [[[1, 2, 3], [4, 5, 6, 7, 8]],
		  [[9, 10], [11, 12, 13]]];

	auto d = [[c[0][0].dup, c[0][1].dup],
		  [c[1][0].dup, c[1][1].dup]];

	d[0][1][1 .. $ - 1] *= 3;

	writeln("c = ", c);
	// [[[1, 2, 3], [4, 5, 6, 7, 8]],
	//  [[9, 10], [11, 12, 13]]] // OK
	writeln("d = ", d);
	// [[[1, 2, 3], [4, 15, 18, 21, 8]],
	//  [[9, 10], [11, 12, 13]]] // OK
}
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http://ideone.com/kJVUhd

Maybe there is a way to create .globalDup for multidimensional 
arrays?