I don't know if I have the exact same problem, but in my case it is because 
gvfs-smb-browse  tries to access a samba server (first problem is why does it 
try to contact it, I never browse samba shares) using ipv6
When gvfs-smb-browse uses the whole cpu core I can run a : 
netstat -laputenW | grep gvfs
And see that gvfs is trying to contact an ipv6 address

I reproduced it at home (16.04) and at work (14.04, happens since a recent 
update, did not happen last month for example) :
- at home it tries to connect to the samba share of my internet box / router, 
using its public ipv6 address, so this will never ever work
- at work it tries to connect to some co workers windows 10 share, using local 
ipv6 addresses 

I have solved my problem by :
- at home, using google ipv6 dns, that way gvfs can't get the ipv6 of my 
internet box and won't try to connect to it
- at work I just disabled ipv6 (switched to local link iirc)

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https://bugs.launchpad.net/bugs/1572260

Title:
  gvfs-smb-browse hogs CPU after only opening nautilus

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