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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: Count of mounting filesystem
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On 28/01/2011 23:04, Serg Z wrote:
> Hello!
>
> How many filesystems I can mount?
> What limits count of mounting filesystem?

Short answer is "too large to bother".

I once did 14,000 mount points just for fun, and it still wasn't the limit:

http://ivoras.net/blog/tree/2009-10-20.the-night-of-1000-jails.html

I think the real limit would be available memory to hold the file system 
structures.