New Zealand brewer Lion Nathan has snatched a 20 per cent share in the country's largest wine producer from under the noses of its Australian rival, Fosters.Lion Nathan this week bought a 19.9 per cent share of Montana Wines, in a lightning raid that caught industry analysts by surprise.It had been widely reported that the Australian giant was interested in buying a stake of the successful wine company, although rumours of a takeover were denied by both sides.