If Voldemort had ever known -- or even suspected -- that one of his inner circle was using Occlumency against him, I don't think that person would have lived for very long. Therefore, either:
- Voldemort never tried to use Legilimency against Snape (which I find extremely unlikely; especially since, as stated at the beginning of HBP, Snape had to defend his actions of the past fourteen years after Voldemort's return); or
- Snape did use Occlumency against Voldemort, but Voldemort was unaware of it.
I lean toward the latter. I'm sure a clumsy beginner's attempt at Occlumency would be easy to spot, but perhaps a skilled-enough Occlumens is able to hide the fact that they're hiding anything -- to leave parts of their mind open while blocking other parts, and leave even a powerful Legilimens like Voldemort none the wiser.
Personally, though, I think that Snape had additional help, beyond even his skill in Occlumency: (spoiler for book 7)
Snape's love for Lily.
Love is the antithesis of everything Voldemort ever stood for; he never understood it, and it actually caused him pain when he possessed Harry in OotP. I think a skilled Occlumens like Snape could turn that to his advantage in steering Voldemort away from any thoughts relating to protecting Harry.
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