About using vartabstop

There's a meme (if it may be called so) circulating on Twitter
about using Fibonacci sequences for indentation. Just for fun,
I wanted to see if it could be implemented using the vartabs
feature. I thought that this would do it (for C files):

set shiftwidth=0
set noexpandtab
set vartabstop=1,1,2,3,5,8,13,21,34
set autoindent
set smartindent
set ft=c

With the above settings, it appears that the value of tabstop
is used. This seems to agree with shiftwidth's documentation:
"When [shiftwidth is] zero the 'ts' value will be used", but
not with tabstop's help: "the value of 'tabstop' will be
ignored while 'vartabstop' is set". Putting together the two,
I would expect the above to use vartabstop.

Am I missing something?

Thanks,
Life.

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