I tried it and repeating quotes works. The XPath expression would be unescaped:

//document[path="/rootNode[itg:fts(.,' ""information to find"" ')]"]

I didn't know you could repeat quotes like that in an XPath expression.  Is this in the spec?  Well, yes it is.  It's in the XPath 2.0 Recommendation: http://www.w3.org/TR/xpath20/#id-literals

I just learned something new.  Thanks for pointing me to this new trick.